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Its not that simple unfortunately - i supply triple glazing and sometimes double glazing to social housing projects. in simple terms our standard triple glazing for example gives a 35 decibel reduction in sound - so if there was a noise at 35db outside you would not hear it (not quite this...

just found this old post with shytalkz responding: //www.diynot.com/forums/viewtopic.php?t=132592 ridge beam size quoted is a little leaner than i worked out but my span is slightly larger so it looks reasonable - I like the flitch plate idea for a full timber look.

anyone any ideas ????

hi, thanks for the reply, the actual unsupported rafter length is 2.4m with a roof pitch of 25 degrees. I intend birdmouthing the rafters over the steel at the ridge and at the wall plate. cheers

Hi - first post so just like to say thanks for all the useful info I have been reading. I am building a glazed extension with a vaulted ceiling, the roof will be triple glazed sealed units. The length of the roof beam between supports is 5.4m, the width between wall plates is 4.4m. I...